Killea (Irish: Cill Fhéich, meaning 'Fiach's church') is a village and civil parish on the border of County Donegal, Ireland, and County Londonderry in Northern Ireland.

Killea was one of several Protestant villages in eastern Donegal that would have been transferred to Northern Ireland, had the recommendations of the Irish Boundary Commission been enacted in 1925.

[1] This border village once had a customs post on the main B193/R237 Letterkenny Road.

Some of the housing in Killea village is on the County Londonderry side of the border.

It is named after its creator, forester Liam Emmery, who planted a Celtic cross design in the woods near Killea.